import poplib
from email.parser import Parser
from email.header import decode_header
from email.utils import parseaddr



def decode_str(s):
    value, charset = decode_header(s)[0]
    if charset:
        value = value.decode(charset)
    return value

def guess_charset(msg):
    charset = msg.get_charset()
    if charset is None:
        content_type = msg.get('Content-Type', '').lower()
        pos = content_type.find('charset=')
        if pos >= 0:
            charset = content_type[pos + 8:].strip()
    return charset

# indent用于缩进显示:
def print_info(msg, indent=0):
    if indent == 0:
        for header in ['From', 'To', 'Subject']:
            value = msg.get(header, '')
            if value:
                if header=='Subject':
                    value = decode_str(value)
                else:
                    hdr, addr = parseaddr(value)
                    name = decode_str(hdr)
                    value = u'%s <%s>' % (name, addr)
            print('%s%s: %s' % ('  ' * indent, header, value))
    if (msg.is_multipart()):
        parts = msg.get_payload()
        for n, part in enumerate(parts):
            print('%spart %s' % ('  ' * indent, n))
            print('%s--------------------' % ('  ' * indent))
            print_info(part, indent + 1)
    else:
        content_type = msg.get_content_type()
        if content_type=='text/plain' or content_type=='text/html':
            content = msg.get_payload(decode=True)
            charset = guess_charset(msg)
            if charset:
                content = content.decode(charset)
            print('%sText: %s' % ('  ' * indent, content + '...'))
        else:
            print('%sAttachment: %s' % ('  ' * indent, content_type))


if __name__ == "__main__":

    email = 'xxxx@xxx.xx'
    password = 'xxxxxxxxxxx'

    pop3_server = 'pop3.xxxx.xx'

    server = poplib.POP3(pop3_server)

    server.set_debuglevel(1)

    print(server.getwelcome().decode('utf-8'))

    # 身份认证
    server.user(email)
    server.pass_(password)

    print("状态信息",server.stat())

    resp,mails,octets = server.list()

    print(mails)

    index = len(mails)

    resp,lines,octets = server.retr(index)

    msg_content = b'\r\n'.join(lines).decode('gbk')

    msg = Parser().parsestr(msg_content)

    server.quit()

    print_info(msg)